FCC Site Work & Foundation Systems Flashcards

What is the purpose of dewatering during excavation in Florida?

Answer: To lower the water table temporarily so excavation and foundation work can be performed in dry conditions

Dewatering uses pumps or well-points to temporarily lower groundwater levels, allowing safe excavation and concrete placement in Florida's high water table environment.

When is a deep foundation system such as driven piles or drilled piers required in Florida?

Answer: When near-surface soils are too weak to support the structure's loads and a suitable bearing stratum lies deeper

Deep foundations transfer structural loads through weak near-surface soils down to stronger bearing strata, which is often necessary in Florida due to loose sands or organic layers.

What is 'differential settlement' and why is it a concern in Florida construction?

Answer: Uneven settling of different parts of a structure, which can cause cracking and structural damage, common on variable Florida soils

Differential settlement occurs when parts of a foundation settle at different rates, placing stress on the structure; Florida's variable soils make this a common risk.

Which OSHA standard governs excavation and trenching safety on construction sites?

Answer: 29 CFR 1926 Subpart P

OSHA 29 CFR 1926 Subpart P covers excavation and trenching safety requirements, including sloping, shoring, and protective system requirements.

What is the minimum depth at which OSHA requires a protective system (shoring, sloping, or trench box) for an excavation?

Answer: 5 feet

OSHA requires a protective system for any excavation 5 feet or deeper in most soil types to prevent cave-in hazards.

In Florida, a contractor performing site grading must ensure that drainage is directed:

Answer: Away from the structure and toward approved drainage outlets

Proper site grading directs stormwater away from the building to prevent foundation erosion, flooding, and moisture intrusion, channeling it to approved drainage systems.